Interlocking sheaves and means for operating the same.



J. R. McGIFFERT & T. H. BLAIR. INTERLOCKING SHEAVES AND MEANS FOROPERATING THE SAME.

APPLICATION FILED JAN- I3. I914.

Patented Sept. 7, 1915.

.N wk 6 m 0 N T E MW w v I T TAI/E'SSE'S COLUMBIA PLANOGRAPH 60..WASHINGTON, D. c.

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JOHN R. MoGIFFERT AND THEODORE H. BLAIR, OF DULUTH, MINNESOTA.

INTERLOCKING SHEAVES AND MEANS FOR OPERATING THE Specification 5rLetters Patent.

Application filed January 13, 1914. Serial No. 811,797.

To all whom it may concern Be it known that we, JOHN R. MGGIFFERT andTHEODORE I-I. BLAIR, citizens of the United States, and residents ofDuluth, county of St. Louis, State of Minnesota, have jointly invented anew and useful Improvement in Interlocking Sheaves and Means forOperating the Same, of whlch the following is a specification, theprinciple of the invention being. herein explained, and the best mode inwhich we havecontemplated applying that principle, so as to distinguishit from other inventionsw The present improvements relating as 1ndicatedto interlocking sheaves and means for operating the same are moreparticularly related and adapted to be used 111 connection withlogskiddingmachines, although of course the invention is by no meanslimited to this specific field. In fact the invention may be usedwhenever it is necessary to permit a lifting and a hauling opera tion aswill be evident from the following description. I

To the accomplishment of these and related ends said invention thenconsists of the means hereinafter fully described and particularlypointedout in the claims.

The annexed drawing and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstituting, however,but one of various mechanical forms in which theprinciple of the invention may be used.

Figure 1 is a more or less diagrammatic view in side elevation, showingour invention as applied to a log skidding machine; Fig. 2 isa partialplan view of the same; and Fig. 3 is a section on the line in Fig. '2.

In order to clearly point out the improvements which we have made insuch -mecl1- anism it may first be desirable to briefly outline theconstructionof the apparatus which has heretofore been used insome casesfor lifting and hauling in'logs and the like.

Referring then-toFig. 1, there is shown a car 1 which may be operatedupon a suitable track 2, there being placed upon this car a boom 3 ofany convenient construction,

which may be maintained in position by any of the usual means, which arenot shown in the present views. Upon the boom is mounted a plurality ofpulleys or sheaves 4, 5 and 6.

Overthese three pulleys are passed cables 7 8 and 9 which are receivedupon suitable winding-in sheaves or drums 10, 11 and 12 respectively,mounted on the car 1. Over the pulley 4 and the winding drum 10 passesthe cable 7 which may be fixed at its outer end to any suitable support,such as a tree, indicated at 13. This cable 7 forms between the pulley 4and the tree 13 a trackway upon which there is movably mounted asuitable carriage 14 which is of a well-known con struction and need notbe further described. The carriage '14 is adapted to be moved away fromthe sheave 4 by or outhauling cable '8, such cable having one endattached to the carriage from which it passes over a sheave 15 attachedto the tree and then back between rollers 16 in the carriage, from whichpoint it passes down over the sheave 6 and to the winding drum 12. Apulley 17 is attached to the carriage 14 and over this pulley passes thecable 8, which may be termed the lifting cable, and which passes overthe sheave 5 to the drum 11, which operatesto wincl in the cable 8 whenit is desired to lift theload, which in the present instance is shown asa log 18.-

It will be understood that by the term sheave as here used, we refer, ofcourse, to any suitable rotative element designed to receive thereover acable orthe like.

Themechanism as so far described has been in use for some time and isunsatisfactory in several respects. It will be noticed that upon thewinding in of the lifting cable 8 the weight of the load 18 over thepulley 17 will tend to move the carriage 14 to the right on the trackway7 To prevent this action a sullicient resistance must be applied to theouthauling cable 9 to either maintain the carriage in 'a stationaryposition or 'to permit the same to move slowly to the right. Thisresistance is secured most conveniently by means of a brake 33 actingupon the drum 12 but the power which must be absorbed by this brake isconsiderable and it is difficult to provide a practical con-' struction.By means of our present invention we have eliminated this difficulty andhave secured a construction which is more convenient to operate,

the boom 3 a short shaft 20 upon which are Patented Sept. 7, 1915..

means of the receding- I safer, and simpler to control. It will benoticed that the cables mounted two rotating elements, preferably in theform of sheaves 21 and 22, each of which are freely rotatable upon theshaft 20.

diverging, thus adapting them to engage with the band 24 upon movementof the sheave 22 toward the sheave 21. Such movement of the sheave 22may be secured in various ways but a simple construction for thispurposes may be as follows.

.tion 26 of theshaft 20 is threaded and adjustably mounted upon thisportion 26is a collar-27 having a radially extending lug 28 engaged bya,link 29 which is connected by-means ofanother link 30'to an operatinglever glwhich maybe maintained in any desired position by means of apawl and ratchet32 mounted uponthecar.

.Fromthe foregoing description the op eratlonj of our invention will beeaslly under 'stood.- When the lifting cable- 8 is-attached to a loadandis ready to be wound in, thus lifting the load, it is onlynecessary tooperate the collar 27 by meansof the lever 31. Thiswaction'resultsin theunlocking of the two sheaves. In operation the outhaul cable 9 is firstheld ina fixed position by means of a suitable brake-33 on the drum .12,during which'time the cable 8 is wound in until thelog is raised to thedesired position. The

sheaves 21 and 22 are theniinterlocked as has been described, when thecable 8 is-wound in thus paying out the cable 9 at thesame speed. 1 I

By passing the cables 8 and 9 around the sheaves21 and 22 a number of(times the resistance necessaryto maintain the carriage ltagainst toorapid movement to the right is greatly. lessened, and with two turnsaround the sheaves the braking power which must be applied to the drum12 is cut'down to merely a fractional part of what is necessary. intheformer constructions. WVe have not here indicated any specific typeof brake for. the drum 12 but indicate diagrammatically abrake133whichmay, of course, take 3' any desired form.

The presentzdevice may be conveniently and manually operatedbytheoperator sta-' tionedon the can. By the use of our inventionmuch powerisIsaved asxwhen hauling long dlstances' the brake required -1n theformer mechanism would absorb consider- A porable power. Furthermore, amuch better control may be had of the cables than when they wereindependently regulated.

The use of the specific type of interlocking sheaves which we haveinvented is by no means confined to lifting and hauling operations asthis feature may be of service in numerous mechanisms.

Other modes of applying the principle of our invention may be employedinstead of the one explained, change being made as regards the mechanismherein disclosed, provided the means stated by any of the followingclaims or the equivalent of such stated means be employed.

Y e therefore particularly point out and distinctly claim as ourinvention 1. In apparatus of the character described, the combinationwith a suitable trackway and a carriage movable therealong; of anouthauling cable attached to said carriage; a lifting cable movablysupported thereover; two axially alined, freely rotatable elementsmovable axially into engagement, each of said cables receiving one ofsaid cables thereover; and means adapted to move said elements into suchengagement, and to lock the same together, whereby the movement of saidouthauling cable is controlled by said lifting cable.

Inapparatus of the character described, the combination with a suitabletrackway and a carriage movable therealong; of an outhauling cableattached to said carriage;

'a lifting cable movably supported thereover; a freely rotatable sheavereceiving thereover said lifting cable; a second sheave axially alinedwith said first-named sheave and movable axially into engagementtherewith, said second sheave being also freely rotatable; and meansadapted to lock said two sheaves together, whereby the movement of saidlifting cable controls the movement of said outhauling cable.

3. In apparatus of the character described, the combination with asuitable trackway and a carriage movable therealong; of an outhaulingcable attached to said carriage; a lifting cable movably supportedthereover; a shaft; a sheave receiving thereover said lifting cable,said sheave being rotatably mounted on said shaft; a second sheavereceiving thereover said outhauling cable, said second sheave being alsorotatably mounted on said shaft adjacent to said firstnamed shaft'andbeing axially movable into engagement with said first-named sheave; andmanually operable means adapted to lock said'two sheaves together,whereby the movementof said lifting cable controls the movement of saidouthauling cable.

4. In apparatus of the character described, the combination with asuitable trackway and a carriage movable therealong; of an outhaulingcable attached to said carriage;

into engagement with said first-named sheave.

5. In apparatus of the character described, the combination with asuitable trackway and a carriage movable therealong; of an outhaulingcable attached to said carriage; a lifting cable movably supportedthereover; a shaft; a sheave rotatably but non-slidably mounted on saidshaft and having a clutch member on one side, said sheave receivingthereon said lifting cable; a second sheave rotatably mounted on saidshaft and having a clutch member on one side adapted to engage suchmember on said first-named sheave upon axial movement of said secondsheave, the latter receiving thereover said outhauling cable, and saidshaft being threaded adjacent to said second sheave; and meansadjustably mounted on such threaded portion of said shaft and adaptedwhen rotated to force said second sheave against said firstnamed sheave,thereby engaging said members.

6. In apparatus of the character described,

the combination with a suitable trackway and a carriage movabletherealong; of an outhauuling cable attached to said carriage; a liftingcable movably supported thereover; a windingdrum adapted to receive andoperate said lifting cable; a second winding drum adapted to receive andoperate said outhauling cable; two freely rotatable elements disposedbetween said drums and said carriage, each of said elements re ceivingone of said cables thereo-ver; and means adapted to, lock said elementstogether, whereby movement of said lifting cable controls the movementof said outhauling cable.

7. In apparatus of the character described, the combination with asuitable trackway and a carriage movable therealong; of anouthaulingcable attached to said carriage; a lifting cable movablysupported thereover; a winding drum adapted to receive and operate saidlifting cable; a second winding drum adapted to receive and operate saidouthauling cable; two sheaves disposed between said drums and saidcarriage, each of said sheaves receiving one of said cables thereover;and means adapted to lock said sheaves together whereby movement of saidlifting cable controls the movement of said outhauling cable.

8. In apparatus of the character described, the combination with asuitable trackway and a carriage movable therealong; of an outhaulingcable attached to said carriage; a lifting cable movably supportedthereover; a winding drum adapted to receive and operate said liftingcable; a second winding drum adapted to receive and operate saidouthauling cable; a shaft; a sheave receiving said lifting cablethereover and mounted on said shaft; a second sheave receiving saidouthauling cable thereover and mounted on said shaft adjacent saidfirstnamed sheave; and means adapted to lock said two sheaves togetherwhereby movement of said lifting cable controls the movement of saidouthauling cable.

9. In apparatus of the character described, the combination with atrackway and a carriage movable along the same; of an outhauling cableconnected to said carriage, passing over a suitable sheave adjacent toone end of the trackway and then passing back parallel to said trackway;a shaft; a sheave rotatably mounted thereon, said sheave receiving saidouthauling cable; a

winding drum adapted toreceive and operate said outhauling cable;braking means on said winding drum tending to prevent movement of thesame in a direction to unwind said cable; a suitable sheave mounted onsaid carriage; a third sheave rotatably mounted on said shaft adjacentsaid first named sheave; a lifting cable passing over said second andlast-named sheaves; a winding drum adapted to receive and operate saidlifting cable; and means adapted to lock together said first-named andsaid lastnamed sheaves.

19igned by us, this 5th day of January,

JOHN 1%., MOGIFFERT.

I THEODORE H. BLAIR.

Attested by J. J. LUMM,

- A. H. SGHRASS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. 0.

